#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import iso8601


class ISO8601Constraint(object):

    def validate(self, value, context):
        try:
            iso8601.parse_date(value)
        except Exception:
            return False
        else:
            return True


def constraint_mapping():
    return {'iso_8601': ISO8601Constraint}
